A simplified analysis method for evaluating the horizontal deformation of adjacent single pile under tunneling

Abstract

To analyze the horizontal response regularity of adjacent pile under tunneling, an analytical method is developed considering the shearing effect of pile to assess the horizontal responses of pile due to adjacent tunneling. Firstly, the pile is considered as a Timoshenko beam resting on the Pasternak foundation model, then, combining with the two-stage method, the additional unloading pressure due to the tunneling excavation is loaded on the pile, thus the equilibrium differential equation considering the pile’s shearing effect is established. Secondly, the specific horizontal deformation of pile is given by the finite difference method. Furthermore, through comparing with the boundary element method, the validity of this theory is verified.Finally, using the theory here, a comparison is made between the results based on the Timoshenko beam and Euler-Bernoulli beam, and find the results taking the shearing effect of pile into account are more close to the classical solution, the parameter analysis also suggests: the pile’s shearing effect is closely related with the disturbance, the stronger the disturbance, the more obvious the pile’s shearing effect.